Are the Chitauri the ones that gave aliens a bad rep? Whoa, wait, seriously? In my universe aliens have been known for a really long time now on earth. Guess that's another difference. There are some aliens that pick on earth because technologically speaking, humans are a couple generations behind so they think earth is easy pickings until they find out they're wrong. I'm not sure if we're thinking of the same stones but if we are, those things hold a lot of power and nothing good ever comes out of gathering them together.